Use reinterpret_cast<> to cast from void* to function pointer.

This fixes a Clang error and matches how we use the return values from
ScopedNativeLibrary::GetFunctionPointer() elsewhere.

BUG=82385

Review URL: https://chromiumcodereview.appspot.com/16024006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@203188 0039d316-1c4b-4281-b951-d872f2087c98
1 file changed